A fix is available
APAR status
Closed as program error.
Error description
You migrate from CICS 3.1 to CICS 4.2 and notice an increase in the amount of CPU used per task in the CICS 4.2 region compared to the CICS 3.1 region. Looking at APA performance reports, we could see more CPU being used in module DFHSMMG. Upon further investigation we learned these applications do very large getmains specifying INITIMG(00). There was a change to this area of code in 4.2 where it does the initial image processing that appears to contribute to this increase in CPU. Additional Symptom(s) Search Keyword(s): KIXREVEPH
Local fix
contact ibm
Problem summary
**************************************************************** * USERS AFFECTED: All CICS users. * **************************************************************** * PROBLEM DESCRIPTION: Increased CPU consumption performing * * large GETMAINs. * **************************************************************** * RECOMMENDATION: * **************************************************************** Large CICS GETMAINs with an INITIMG of zeros, consume an increased amount of CPU, when compared with earlier versions of CICS Transaction Server for z/OS.
Problem conclusion
The operations performed to initialise storage returned by a CICS GETMAIN with zeros, have been modified to improve performance.
Temporary fix
********* * HIPER * ********* FIX AVAILABLE BY PTF ONLY
Comments
APAR Information
APAR number
PM83479
Reported component name
CICS TS Z/OS V4
Reported component ID
5655S9700
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt
Submitted date
2013-02-23
Closed date
2013-04-26
Last modified date
2013-06-04
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PM86983 UK93832
Modules/Macros
DFHSMMG
Fix information
Fixed component name
CICS TS Z/OS V4
Fixed component ID
5655S9700
Applicable component levels
R700 PSY UK93832
UP13/05/02 P F305
Fix is available
Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.
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Document Information
Modified date:
04 June 2013